Abstract
A reel-to-reel electron beam evaporation system has been developed to continuously deposit Y-BaF2-Cu precursor for ex situ YBa2Cu3O7-x (YBCO) processed films. The quality of a YBCO film on biaxially textured, oxide buffered, Ni tape strongly depends on the condition of the precursor deposit. For continuous precursor deposition, a uniform cation stoichiometry (i.e., Y:Ba:Cu = 1:2:3) over the entire length of precursor film is essential. Rutherford backscattering spectrometry studies indicated that the partial pressure of water vapor during the deposition has a significant effect on cation deposition rates and the oxygen content in the precursor film. The oxygen content of the precursor is increased and the precursor stability upon exposure to air is improved by introduction of water vapor during precursor deposition. High quality precursor films with a thickness of 300 nm have been deposited on lengths of rolling-assisted, biaxially textured substrates in the reel-to-reel electron beam evaporation system. In this paper, long length precursor deposition processing will be discussed. Properties of some post-annealed YBCO films will also be presented.
Original language | English |
---|---|
Pages (from-to) | 175-181 |
Number of pages | 7 |
Journal | Physica C: Superconductivity and its Applications |
Volume | 351 |
Issue number | 2 |
DOIs | |
State | Published - Mar 15 2001 |
Funding
The authors would like to thank R.A. Hawsey for his support. X. Cui and B.W. Kang would like to acknowledge the support from Oak Ridge Associated Universities. This work was conducted in part under a CRADA with 3M/Southwire/LANL funded by the US Department of Energy, the Office of Energy Efficiency and Renewable Energy, and the Office of Science. Oak Ridge National Laboratory is managed by Lockheed Martin Energy Research Corporation for the US Department of Energy under contract no. DE-AC05-96OR22464.